AQA CHEM2 ~ May 23rd 2012 ~ AS Chemistry

Reply 1980

OP

Oxidising Agent: Electron Acceptor
Reducing Agent: Electron Donator

Oidation: Loss of Electrons
Reduction: Gain of Electrons

Reply 1981

The Bright Beast

2

what are the grade boundaries usually around?

Reply 1982

m rowe29

4

Original post by Jack_Smith

Ive done everything yet i think i know nothing :/

You think you know nothing, in reality you know alot more than you think. Just stay calm in the exam and try your best... There's always retakes :smile:

Reply 1983

berryripple

Is the reducing product the thing that has been reduced? Or is it the product of what's left of the reducing agent?

Reply 1984

berryripple

Original post by The Bright Beast

what are the grade boundaries usually around?

I think June 11 was 79/100 for an A :smile:

Reply 1985

Jack_Smith

8

Original post by m rowe29

You think you know nothing, in reality you know alot more than you think. Just stay calm in the exam and try your best... There's always retakes :smile:

Im trying to to not think of retakes cause that puts me back of other things! im just worried for questions about alcohols :/

Reply 1986

Seanyboy57

I shall be going in to school now. Good luck to everybody, keep your head in the exam and if it seems like you haven't learnt anything to do with a particular question, remember that they're probably trying to get you to apply something you already know.

Back in a few hours to check my answers with the unofficial mark scheme :biggrin:

Reply 1987

Sorro10

OP

5

Original post by Seanyboy57

I shall be going in to school now. Good luck to everybody, keep your head in the exam and if it seems like you haven't learnt anything to do with a particular question, remember that they're probably trying to get you to apply something you already know.

Back in a few hours to check my answers with the unofficial mark scheme :biggrin:

Samee,

good luck all :biggrin:

Reply 1988

Mocking_bird

11

I still have half an hour to kill before I leave, gah :lol:

Just going to continue going through the mark schemes I think.

Reply 1989

m rowe29

4

Isomerism!

An isomer is something that has the same structural formula but...

Stereoisomerism: ...atoms arrranged differently in space
Positional Isomerism: ...functional group on a different position along the carbon chain
Functional group isomerism: ...different functional group attached to the carbon chain
Chain isomerism: ...different hydrocarbon chain length

Reply 1990

RoyalBlue7

19

Hey I'm not supposed to post anything here but as you'll are senior students of Chemistry I hope anyone here would solve a problem.
In the IGCSE exam they gave a graph which shows Volume of CO2 being produced vs Time in an experiment investigating rate of reaction and concentration of acid. They told us to add to the grid a sketch of a graph representing a reaction in the same conditions but with only half the concentration of the acidic reactant. OK the initial gradient (ROR) had to be less than the other graph but how long will the reaction take to complete, when compared with the other graph. I sketched the graph showing it levveling off to be parallel to the time axis just before the previous graph levels off. Is this correct? The *&%*ing textbook suggested that the half the conc reaction should come into completion after the full conc reaction does. bBt I think that's wrong. Doesn't the full concentration reaction too reach a point of half the concentration that resembles the initial moments of the half the concentration reaction?
If anyone knows if I am right or wrong please quote and reply. Thanks

i think i got 0 ums

Original post by Seanyboy57

For mechanisms, yes, they just use structural formulae on the mark scheme to save space :smile:

Excellent - thank you!

Good luck everyone!

Reply 1993

berryripple

Got to get ready to leave now.
Good luck everyone, see you for the nervous post-exam discussion :wink:

Reply 1994

bananarama2

Original post by berryripple

Got to get ready to leave now.
Good luck everyone, see you for the nervous post-exam discussion :wink:

Discussion/crying in a hole.

Reply 1995

berryripple

Original post by wcp100

Discussion/crying in a hole.

Precisely

Good luck!

Reply 1996

Sorro10

OP

5

20 minutes left :ssssssssssssssssssssssss

Reply 1997

Sorro10

OP

5

v Next post will probably be after the exam, GOOD LUCK.

Good luck everyone.

Hey I'm not supposed to post anything here but as you'll are senior students of Chemistry I hope anyone here would solve a problem.
In the IGCSE exam they gave a graph which shows Volume of CO2 being produced vs Time in an experiment investigating rate of reaction and concentration of acid. They told us to add to the grid a sketch of a graph representing a reaction in the same conditions but with only half the concentration of the acidic reactant. OK the initial gradient (ROR) had to be less than the other graph but how long will the reaction take to complete, when compared with the other graph. I sketched the graph showing it levveling off to be parallel to the time axis just before the previous graph levels off. Is this correct? The *&%*ing textbook suggested that the half the conc reaction should come into completion after the full conc reaction does. bBt I think that's wrong. Doesn't the full concentration reaction too reach a point of half the concentration that resembles the initial moments of the half the concentration reaction?
If anyone knows if I am right or wrong please quote and reply. Thanks

AQA CHEM2 ~ May 23rd 2012 ~ AS Chemistry

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